Bug 1613192: Fix non-unified build bustage in layout/{base,generic} directories. r=TYLin

Summary of the changes/reasons:

- LayoutTelemetryTools.h directly uses several types whose headers it needs to
  include. (These includes were present in its .cpp file; I'm migrating them
  from there to the .h file, and I'm adding a new include for "Saturate.h" to
  provide the SaturateUint8 type.)

- LayoutTelemetryTools.cpp needs an include for MainThreadUtils.h, to provide
  NS_IsMainThread().

- StaticPresData.cpp needs an include for ServoUtils.h, to provide
  AssertIsMainThreadOrServoFontMetricsLocked().

- ZoomConstraintsClient.h needs a forward-decl for mozilla::dom::Document since
  it uses a pointer of that type in a function-decl.

- ScrollSnap.h needs forward-decls of nsPoint/nsRect for some references to
  those types in a method signature.

- nsGridContainerFrame.cpp needs an include for nsBoxLayoutState.h since it
  uses that type (it instantiates a nsBoxLayoutState instance).

- nsPlaceholderFrame.cpp needs a "using" decl for the mozilla::dom namespace in
  order to use the un-namespace-prefixed "Element" type.

Differential Revision: https://phabricator.services.mozilla.com/D61603

--HG--
extra : moz-landing-system : lando

layout/base/LayoutTelemetryTools.cpp

@@ -6,10 +6,8 @@
 
 #include "mozilla/layout/LayoutTelemetryTools.h"
 
+#include "MainThreadUtils.h"
 #include "mozilla/Atomics.h"
-#include "mozilla/EnumeratedArray.h"
-#include "mozilla/EnumeratedRange.h"
-#include "mozilla/FlushType.h"
 #include "mozilla/Telemetry.h"
 
 using namespace mozilla;

layout/base/LayoutTelemetryTools.h

@@ -9,6 +9,10 @@
 #ifndef mozilla_LayoutTelemetryTools_h
 #define mozilla_LayoutTelemetryTools_h
 
+#include "mozilla/EnumeratedArray.h"
+#include "mozilla/EnumeratedRange.h"
+#include "mozilla/FlushType.h"
+#include "mozilla/Saturate.h"
 #include "mozilla/TimeStamp.h"
 
 #define LAYOUT_TELEMETRY_RECORD(subsystem) \

layout/base/StaticPresData.cpp

@@ -8,7 +8,9 @@
 
 #include "mozilla/Preferences.h"
 #include "mozilla/ServoBindings.h"
+#include "mozilla/ServoUtils.h"
 #include "nsPresContext.h"
+
 namespace mozilla {
 
 static StaticPresData* sSingleton = nullptr;

layout/base/ZoomConstraintsClient.h

@@ -16,6 +16,7 @@
 namespace mozilla {
 class PresShell;
 namespace dom {
+class Document;
 class EventTarget;
 }  // namespace dom
 }  // namespace mozilla

layout/generic/ScrollSnap.h

@@ -10,6 +10,9 @@
 #include "mozilla/ScrollTypes.h"
 #include "mozilla/Maybe.h"
 
+struct nsPoint;
+struct nsRect;
+
 namespace mozilla {
 
 namespace layers {

layout/generic/nsGridContainerFrame.cpp

@@ -24,6 +24,7 @@
 #include "mozilla/PresShell.h"
 #include "nsAbsoluteContainingBlock.h"
 #include "nsAlgorithm.h"  // for clamped()
+#include "nsBoxLayoutState.h"
 #include "nsCSSAnonBoxes.h"
 #include "nsCSSFrameConstructor.h"
 #include "nsDataHashtable.h"

layout/generic/nsPlaceholderFrame.cpp

@@ -26,6 +26,7 @@
 #include "nsIContentInlines.h"
 
 using namespace mozilla;
+using namespace mozilla::dom;
 using namespace mozilla::gfx;
 
 nsPlaceholderFrame* NS_NewPlaceholderFrame(PresShell* aPresShell,